参数资料
型号: IR3082MTRPBF
厂商: International Rectifier
文件页数: 26/33页
文件大小: 0K
描述: IC CTLR XPHASE 20-MLPQ
标准包装: 3,000
系列: XPhase™
应用: 处理器
电流 - 电源: 10mA
电源电压: 9.6 V ~ 16 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 20-MLPQ
供应商设备封装: 20-MLPQ(5x5)
包装: 带卷 (TR)
IR3082P b F
From Figure 15, the source current of VDAC pin is 170uA. The VDAC up-slope slew rate is
SR UP =
I SOURCE
C VDAC
=
170 ? 10 ? 6
47 ? 10 ? 9
= 3 . 6 mV / uS
Over Current Setting Resistor R OCSET
The room temperature is 25oC and the target PCB temperature is 100 oC. The phase IC die temperature is about 1
oC higher than that of phase IC, and the inductor temperature is close to PCB temperature.
Calculate Inductor DC resistance at 100 oC,
R L _ MAX = R L _ ROOM ? [ 1 + 3850 ? 10 ? 6 ? ( T L _ MAX ? T ROOM )] = 0 . 42 ? 10 ? 3 ? [ 1 + 3850 ? 10 ? 6 ? ( 100 ? 25 )] = 0 . 54 m ?
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated as,
G CS _ MIN = G CS _ ROOM ? [ 1 ? 1470 ? 10 ? 6 ? ( T IC _ MAX ? T ROOM )] = 34 ? [ 1 ? 1470 ? 10 ? 6 ? ( 101 ? 25 )] = 30 . 2
Set the over current limit at 115A. From Figure 14, the bias current of OCSET pin (I OCSET ) is 65uA with
R OSC =18.2k ? . The total current sense amplifier input offset voltage is 0.6mV, which includes the offset created by
the current sense amplifier input resistor mismatch.
Calculate constant K P, the ratio of inductor peak current over average current in each phase,
K P =
( V I ? V O ) ? V O /( L ? V I ? f SW ? 2 )
I LIMIT / n
=
( 12 ? 1 . 335 ) ? 1 . 335 /( 220 ? 10 ? 9 ? 12 ? 600 ? 10 3 ? 2 )
115 / 5
= 0 . 147
R OCSET = [
R LIMIT
n
? R L _ MAX ? ( 1 + K P ) + V CS _ TOFST ] ? G CS _ MIN / I OCSET
= (
115
5
? 0 . 54 ? 10 ? 3 ? 1 . 147 + 0 . 6 ? 10 ? 3 ) ? 30 . 2 /( 65 ? 10 ? 6 ) = 6 . 9 k ?
No Load Output Voltage Setting Resistor R FB and Adaptive Voltage Positioning Resistor R DRP
From Figure 14, the bias current of FB pin is 65uA with R OSC =18.2k ? .
R FB =
R L _ MAX ? V O _ NLOFST ? V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
=
0 . 54 ? 10 ? 3 ? 15 ? 10 ? 3 ? 0 . 6 ? 10 ? 3 ? 5 ? 0 . 75 ? 10 ? 3
65 ? 10 ? 6 ? 0 . 54 ? 10 ? 3
= 230 ?
Select RFB = 232 ? .
R DRP =
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
=
232 ? 0 . 54 ? 10 ? 3 ? 30 . 2
5 ? 0 . 75 ? 10 ? 3
= 1 . 01 k ?
Page 26 of 33
01/31/05
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